1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → tert-Butyl 2-(5-(3-chloro-1H-pyrrole-2-carboxamido)-1H-indol-1-yl)acetate

Participants

Reaction Conditions

Reaction Steps

DIPEA (4.0 equiv.), EDCI (1.5 equiv.) and HOBt (1.0 equiv.) were added at 0° C. to a solution of 3-chloro-1H-pyrrole-2-carboxylic acid (5.24 mmol, 1.0 equiv.) in DCM (25 ml). The mixture was stirred for 15 min at 25° C. and then cooled to 0° C. again. A solution of tert-butyl 2-(6-amino-1H-indol-1-yl)acetate (intermediate A—for synthesis see above) (5.24 mmol, 1.0 equiv.) in DCM (10 ml) was added, and the reaction mixture was stirred for 16 h at 25° C. It was then diluted with DCM (200 ml), washed with sat. ammonium chloride solution (2×50 ml), sat. sodium hydrogen carbonate solution (2×50 ml) and sat. NaCl solution (2×50 ml), dried over Na2SO4 and concentrated under reduced pressure. The crude product was purified by column chromatography (6% methanol in DCM). Yield: 56%

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